G.f. A(x) satisfies A(x) = 1/( (1 - x) * (1 - x*A(x)) )^2.
A379281
G.f. A(x) satisfies A(x) = 1/( (1 - x) * (1 - x*A(x)) )^2.
Terms
- a(0) =1a(1) =4a(2) =18a(3) =96a(4) =575a(5) =3706a(6) =25078a(7) =175666a(8) =1262723a(9) =9261018a(10) =69024147a(11) =521281642a(12) =3980391050a(13) =30678331440a(14) =238350850248
External references
- oeis: A379281